海上聚合物驱油藏堵塞位置定量表征方法

Quantitative characterization methods of plugging position of offshore polymer flooding reservoir

瞿朝朝 李彦来 王立垒 周凤军 王欣然

中海石油（中国）有限公司天津分公司渤海石油研究院，天津 300452

Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China

针对海上聚驱油藏注聚区地层堵塞，采油井产液量下降幅度大，产能无法完全释放的问题，运用数值模拟方法，在聚合物驱堵塞机理研究基础上，利用井指数和传导率等效表征地层堵塞，模拟油藏不同位置堵塞情况下油水井的动态响应特征，基于此建立了快速诊断聚驱油藏堵塞位置图版。另外，利用油藏工程方法和试井技术进一步推导了堵塞半径定量预测解析模型。该方法在渤海L油田矿场实践表明：研究成果不仅能定性判断聚驱油藏堵塞位置，且能定量表征堵塞半径的大小，为实施精细解堵提供了理论支持，对海上同类油田起到较好的借鉴作用。

In order to solve the problems of stratum blockage in the area of offshore polymer flooding reservoir, the decrease of fluid production of producing wells and the production capacity that cannot be fully released, the simulation method based on the study of plugging mechanism of polymer flooding was used to equivalently characterize formation plugging by well index and conductivity, and dynamic response characteristics of oil-water wells under reservoir plugging at different locations were then simulated. Based on this method, a rapid diagnostic block location chart for polymer flooding reservoirs was established. In addition, an model for quantitative prediction of plugging radius was further derived by using reservoir engineering method and well testing technology. The application in Bohai L oilfield shows that the result can not only qualitatively judge the plugging location, but also quantitatively characterize the size of plugging radius, which provides strong theoretical support for plugging removal and can be used for reference in similar offshore oilfields.

10.6056/dkyqt201903019